Papounet, which sizes of SL4 have you used on which board? How did you find this fin after testing against SL2?

For a given contitions, which fin will perform better (top speed/range/upwind/control) - SL2 or 2cm bigger SL4? For example, do you think that I would still lack upwind and power if I take SL4 44 instead of SL2 42?

I have SL4 34 and SL2 36 so it is hard to compare for me... I like both fins very very much, and I do not find SL4 to lack power.